Search notes:

/sys/bus

/sys/bus is a directory for the available bus types (PCI, IDE, USB) in the kernel.

Each directory under /sys/bus contains at least the following two subdirectories:

Directories I've found under /sys/bus include:

`acpi`
`clockevents`
`clocksource`
`container`
`cpu`
`dax`
`event_source`
`hid`
`i2c`
`mdev`
`memory`
`nd`
`nvmem`
`pci`
`pci_express`
`platform`
`pnp`
`scsi`
`serio`
`usb`
`usb-serial`
`vdpa`
`virtio`
`vmbus`	Windows Subsystem for Linux: Bus to Hyper-V (see `drivers/hv/vmbus_drv.c`).
`workqueue`